* { margin: 0; padding: 0; box-sizing: border-box; }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            min-height: 100dvh;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: background-color 0.6s ease;
            color: #1a1a2e;
        }

        body.mode-login { background: #fef5f0; }
        body.mode-signup { background: #eefbf5; }
        body.mode-forgot { background: #f0f4fe; }
        body.mode-reset-otp { background: #f0f4fe; }

        /* ====== Auth Card ====== */
        .auth-container {
            width: 100%;
            max-width: 920px;
            padding: 20px;
        }

        .auth-card {
            background: #fff;
            border-radius: 24px;
            box-shadow: none;
            display: flex;
            overflow: hidden;
            min-height: 560px;
            animation: cardIn 0.4s ease;
        }

        @keyframes cardIn {
            from { opacity: 0; transform: translateY(12px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* ====== Left Panel (Form) ====== */
        .form-panel {
            flex: 1;
            padding: 36px 40px 32px;
            display: flex;
            flex-direction: column;
            position: relative;
            overflow: hidden;
            box-shadow: none;
        }

        .form-body {
            flex: 1;
            position: relative;
        }

        .app-brand-logo {
            width: 42px;
            height: 42px;
            border-radius: 12px;
            object-fit: cover;
            border: none;
            background: transparent;
            box-shadow: none;
            flex-shrink: 0;
        }

        .form-header {
            margin-bottom: 10px;
        }

        .form-title-row {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 4px;
        }

        .form-title-stack {
            min-height: 42px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .form-header h1 {
            font-size: 28px;
            font-weight: 700;
            line-height: 1.2;
            transition: color 0.4s ease;
        }

        .form-header .subtitle {
            font-size: 14px;
            color: #777;
            margin-top: 0;
        }

        .app-name-inline {
            margin-top: 20px;
            font-size: 12px;
            font-weight: 700;
            color: #334155;
            line-height: 1.2;
            word-break: break-word;
            display: inline-flex;
            align-items: center;
            padding: 5px 10px;
            border-radius: 10px;
            border: 1px solid #dbe4ff;
            background: #f5f8ff;
        }

        body.mode-login .form-header h1 { color: #000; }
        body.mode-login .app-name-inline { background: #fff3ee; border-color: #fed7c9; color: #c2410c; }
        body.mode-signup .form-header h1 { color: #000; }
        body.mode-signup .app-name-inline { background: #ecfdf3; border-color: #bbf7d0; color: #15803d; }
        body.mode-forgot .form-header h1 { color: #000; }
        body.mode-forgot .app-name-inline,
        body.mode-reset-otp .app-name-inline { background: #eef4ff; border-color: #bfdbfe; color: #1d4ed8; }
        body.mode-reset-otp .form-header h1 { color: #000; }

        /* ====== Right Panel (Illustration) ====== */
        .illustration-panel {
            width: 400px;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 32px;
            transition: background-color 0.6s ease;
            position: relative;
            overflow: hidden;
        }

        body.mode-login .illustration-panel { background: #fef0ea; }
        body.mode-signup .illustration-panel { background: #e5f8ef; }
        body.mode-forgot .illustration-panel,
        body.mode-reset-otp .illustration-panel { background: #e8eefe; }

        .illustration-panel .illust {
            position: absolute;
            inset: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 32px;
            opacity: 0;
            transition: opacity 0.5s ease;
            pointer-events: none;
        }

        .illustration-panel .illust.active {
            opacity: 1;
            pointer-events: auto;
        }

        .illustration-panel .illust img {
            width: 100%;
            max-width: 320px;
            height: auto;
            object-fit: contain;
        }

        /* ====== Form Sections (transition wrapper) ====== */
        .form-section {
            display: none;
            opacity: 0;
            transform: translateY(10px);
            pointer-events: none;
        }

        .form-section.active {
            display: block;
            opacity: 1;
            transform: translateY(0);
            pointer-events: auto;
            animation: sectionIn 0.35s ease forwards;
        }

        .form-section.leaving {
            display: block;
            animation: sectionOut 0.2s ease forwards;
            pointer-events: none;
        }

        @keyframes sectionIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        @keyframes sectionOut {
            from { opacity: 1; transform: translateY(0); }
            to { opacity: 0; transform: translateY(-10px); }
        }

        /* ====== Forms ====== */
        .form-group {
            margin-bottom: 14px;
        }

        .form-group label {
            display: none;
        }

        .input-field {
            width: 100%;
            padding: 14px 16px;
            border: 1.5px solid #e2e2e5;
            border-radius: 10px;
            font-size: 12px;
            color: #1a1a2e;
            outline: none;
            background: #fafafa;
            transition: border-color 0.2s, box-shadow 0.2s, background-color 0.2s;
        }

        .input-field::placeholder { color: #aaa; }

        .input-field:focus {
            background: #fff;
            border-color: #667eea;
            box-shadow: 0 0 0 3px rgba(102,126,234,0.10);
        }

        .input-toggle-wrap {
            position: relative;
        }

        .input-toggle-wrap .input-field {
            padding-right: 44px;
        }

        .input-toggle-btn {
            position: absolute;
            right: 12px;
            top: 50%;
            transform: translateY(-50%);
            border: none;
            background: transparent;
            color: #888;
            cursor: pointer;
            padding: 4px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            line-height: 1;
        }

        .input-toggle-btn:hover {
            color: #555;
        }

        .input-toggle-btn svg {
            width: 16px;
            height: 16px;
            display: block;
        }

        body.mode-login .input-field:focus {
            border-color: #e8583e;
            box-shadow: 0 0 0 3px rgba(232,88,50,0.10);
        }

        body.mode-signup .input-field:focus {
            border-color: #0d9e6d;
            box-shadow: 0 0 0 3px rgba(13,158,109,0.10);
        }

        body.mode-forgot .input-field:focus,
        body.mode-reset-otp .input-field:focus {
            border-color: #3b6ade;
            box-shadow: 0 0 0 3px rgba(59,106,222,0.10);
        }

        .form-group .hint {
            font-size: 11px;
            color: #999;
            margin-top: 5px;
        }

        .password-row {
            display: flex;
            justify-content: flex-end;
            margin-bottom: 6px;
            margin-top: -8px;
        }

        .forgot-link {
            font-size: 13px;
            color: #e8583e;
            text-decoration: none;
            cursor: pointer;
            background: none;
            border: none;
            font-family: inherit;
            padding: 0;
        }

        .forgot-link:hover { text-decoration: underline; }

        /* ====== Buttons ====== */
        .btn-primary {
            width: 100%;
            padding: 14px;
            border: none;
            border-radius: 10px;
            color: white;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: opacity 0.2s, transform 0.1s, background 0.4s;
            margin-top: 8px;
            position: relative;
        }

        body.mode-login .btn-primary { background: #e8583e; }
        body.mode-signup .btn-primary { background: #0d9e6d; }
        body.mode-forgot .btn-primary,
        body.mode-reset-otp .btn-primary { background: #3b6ade; }

        .btn-primary:hover { opacity: 0.9; }
        .btn-primary:active { transform: scale(0.99); }
        .btn-primary:disabled { opacity: 0.55; cursor: not-allowed; }

        .btn-primary .spinner {
            display: none;
            width: 18px;
            height: 18px;
            border: 2px solid rgba(255,255,255,0.3);
            border-top-color: white;
            border-radius: 50%;
            animation: spin 0.6s linear infinite;
            position: absolute;
            right: 16px;
            top: 50%;
            transform: translateY(-50%);
        }

        .btn-primary.loading .spinner { display: block; }
        .btn-primary.loading { padding-right: 44px; }

        .divider {
            display: flex;
            align-items: center;
            margin: 14px 0;
            gap: 12px;
        }

        .divider::before, .divider::after {
            content: '';
            flex: 1;
            height: 1px;
            background: #e2e2e5;
        }

        .divider span {
            font-size: 12px;
            color: #999;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            white-space: nowrap;
        }

        .btn-passkey {
            width: 100%;
            padding: 12px 14px;
            border-radius: 10px;
            border: 1.5px solid #e2e2e5;
            background: #fff;
            color: #1a1a2e;
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            transition: border-color 0.2s, background 0.2s, box-shadow 0.2s, opacity 0.2s;
            font-family: inherit;
            position: relative;
        }

        .btn-passkey:hover {
            border-color: #ccc;
            background: #f8f8fa;
            box-shadow: 0 1px 4px rgba(0,0,0,0.04);
        }

        .btn-passkey:active {
            transform: scale(0.995);
        }

        .btn-passkey svg {
            flex-shrink: 0;
        }

        .btn-passkey:disabled {
            opacity: 0.55;
            cursor: not-allowed;
        }

        .btn-passkey .spinner {
            display: none;
            width: 18px;
            height: 18px;
            border: 2px solid rgba(0,0,0,0.15);
            border-top-color: currentColor;
            border-radius: 50%;
            animation: spin 0.6s linear infinite;
            position: absolute;
            right: 16px;
            top: 50%;
            transform: translateY(-50%);
        }

        .btn-passkey.loading .spinner { display: block; }
        .btn-passkey.loading {
            opacity: 0.6;
            pointer-events: none;
            padding-right: 44px;
        }

        .passkey-note {
            margin-top: 8px;
            margin-bottom: 0;
            font-size: 12px;
            color: #777;
            line-height: 1.5;
        }

        .passkey-note.ready { color: #0f766e; }
        .passkey-note.error { color: #b91c1c; }

        @keyframes spin { to { transform: translateY(-50%) rotate(360deg); } }

        /* ====== OTP Inline Section ====== */
        .otp-inline {
            display: none;
            animation: fadeIn 0.3s ease;
        }

        .otp-inline.active { display: block; }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(8px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .otp-inline .otp-info {
            text-align: center;
            font-size: 13px;
            color: #555;
            margin-bottom: 10px;
            line-height: 1.5;
        }

        .otp-inline .otp-info strong { color: #1a1a2e; }

        .otp-inputs {
            display: flex;
            gap: 8px;
            justify-content: center;
            margin-bottom: 10px;
        }

        .otp-input {
            width: 42px;
            height: 48px;
            text-align: center;
            font-size: 20px;
            font-weight: 600;
            border: 1.5px solid #e0e0e0;
            border-radius: 10px;
            outline: none;
            background: #fafafa;
            transition: border-color 0.2s, box-shadow 0.2s;
            color: #1a1a2e;
        }

        .otp-input:focus {
            border-color: #e8583e;
            box-shadow: 0 0 0 3px rgba(232,88,50,0.10);
            background: #fff;
        }

        body.mode-signup .otp-input:focus {
            border-color: #0d9e6d;
            box-shadow: 0 0 0 3px rgba(13,158,109,0.10);
        }

        body.mode-reset-otp .otp-input:focus {
            border-color: #3b6ade;
            box-shadow: 0 0 0 3px rgba(59,106,222,0.10);
        }

        /* ====== Bottom Row ====== */
        .bottom-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 14px;
            font-size: 13px;
        }

        .bottom-row .info-text {
            color: #999;
        }

        .bottom-row .switch-link {
            font-weight: 600;
            text-decoration: none;
            cursor: pointer;
            border: none;
            background: none;
            font-family: inherit;
            font-size: 13px;
            padding: 0;
        }

        body.mode-login .bottom-row .switch-link { color: #e8583e; }
        body.mode-signup .bottom-row .switch-link { color: #0d9e6d; }
        body.mode-forgot .bottom-row .switch-link,
        body.mode-reset-otp .bottom-row .switch-link { color: #3b6ade; }

        .bottom-row .switch-link:hover { text-decoration: underline; }

        .btn-link {
            display: block;
            text-align: center;
            margin-top: 14px;
            text-decoration: none;
            font-size: 13px;
            cursor: pointer;
            background: none;
            border: none;
            font-family: inherit;
            padding: 0;
        }

        body.mode-forgot .btn-link,
        body.mode-reset-otp .btn-link { color: #3b6ade; }

        .btn-link:hover { text-decoration: underline; }

        /* ====== Messages ====== */
        .msg {
            padding: 12px 14px;
            border-radius: 10px;
            font-size: 13px;
            margin-bottom: 10px;
            display: none;
        }

        .msg.error {
            background: #fef2f2;
            color: #c0392b;
            border: 1px solid #fecaca;
            display: block;
        }

        .msg.success {
            background: #f0fdf4;
            color: #15803d;
            border: 1px solid #bbf7d0;
            display: block;
        }

        /* ====== Footer ====== */
        .footer {
            text-align: center;
            margin-top: 20px;
            font-size: 12px;
            color: #aaa;
        }

        .footer a { color: #667eea; text-decoration: none; }
        .footer a:hover { text-decoration: underline; }

        /* ====== Responsive ====== */
        @media (max-width: 720px) {
            html,
            body {
                background: #fef5f0 !important;
            }

            body,
            body.mode-login,
            body.mode-signup,
            body.mode-forgot,
            body.mode-reset-otp {
                align-items: center;
                justify-content: center;
                overflow-y: auto;
                -webkit-overflow-scrolling: touch;
                -webkit-text-size-adjust: 100%;
                color: #1f2937;
                padding: 0;
            }

            body.mode-login { background: #fef5f0 !important; }
            body.mode-signup { background: #eefbf5 !important; }
            body.mode-forgot,
            body.mode-reset-otp { background: #f0f4fe !important; }

            .illustration-panel { display: none; }

            .auth-container {
                width: 100%;
                max-width: 430px;
                padding: calc(16px + env(safe-area-inset-top)) 12px calc(16px + env(safe-area-inset-bottom));
                min-height: 100dvh;
                display: flex;
                flex-direction: column;
                justify-content: center;
            }

            body.keyboard-open .auth-container {
                justify-content: flex-start;
                padding-top: calc(8px + env(safe-area-inset-top));
            }

            .auth-card {
                background: transparent;
                border: none;
                border-radius: 22px;
                box-shadow: none;
                min-height: unset;
                overflow: visible;
            }

            .form-panel {
                background: transparent;
                border-radius: inherit;
                box-shadow: none;
                padding: 24px 20px 18px;
            }

            .app-brand-logo {
                width: 36px;
                height: 36px;
                border-radius: 10px;
                border: none;
                background: transparent;
                box-shadow: none;
            }

            .form-title-row {
                gap: 10px;
                margin-bottom: 2px;
            }

            .form-title-stack {
                min-height: 36px;
            }

            .app-name-inline {
                font-size: 11px;
                margin-top: 18px;
                padding: 4px 9px;
            }

            .form-header {
                text-align: left;
                margin-bottom: 12px;
            }

            .form-header h1 {
                font-size: 21px;
                letter-spacing: -0.01em;
            }

            .form-header .subtitle {
                font-size: 11px;
                color: #6b7280;
                margin-top: 0;
            }

            .input-field {
                font-size: 16px;
                line-height: 1.2;
                padding: 11px 12px;
                border-radius: 10px;
                background: #f9faff;
                border-color: #d8deef;
                color: #111827;
            }

            .input-field::placeholder {
                color: #94a3b8;
                font-size: 0.9em;
            }

            .input-field:focus {
                border-color: #6366f1;
                box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.18);
                background: #ffffff;
            }

            body.mode-login .input-field:focus {
                border-color: #f97316;
                box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.18);
            }

            body.mode-signup .input-field:focus {
                border-color: #22c55e;
                box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.18);
            }

            body.mode-forgot .input-field:focus,
            body.mode-reset-otp .input-field:focus {
                border-color: #3b82f6;
                box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.18);
            }

            .input-toggle-btn { color: #9aa4bc; }
            .input-toggle-btn:hover { color: #556180; }

            .form-group .hint { color: #8a94a8; }

            .form-group label {
                display: block;
                font-size: 11px;
                font-weight: 600;
                color: #7b869d;
                margin-bottom: 6px;
                letter-spacing: 0.01em;
            }

            .forgot-link {
                color: #4f46e5;
                font-size: 11px;
            }

            body.mode-login .forgot-link { color: #ea580c; }
            body.mode-signup .forgot-link { color: #16a34a; }
            body.mode-forgot .forgot-link,
            body.mode-reset-otp .forgot-link { color: #2563eb; }

            .forgot-link:hover { color: #4338ca; }
            body.mode-login .forgot-link:hover { color: #c2410c; }
            body.mode-signup .forgot-link:hover { color: #15803d; }
            body.mode-forgot .forgot-link:hover,
            body.mode-reset-otp .forgot-link:hover { color: #1d4ed8; }

            .btn-primary {
                font-size: 13px;
                padding: 11px;
                border-radius: 10px;
                margin-top: 10px;
                background: linear-gradient(135deg, #f97316, #ea580c) !important;
                box-shadow: 0 10px 22px rgba(249, 115, 22, 0.24);
            }

            body.mode-signup .btn-primary {
                background: linear-gradient(135deg, #22c55e, #16a34a) !important;
                box-shadow: 0 10px 22px rgba(34, 197, 94, 0.24);
            }

            body.mode-forgot .btn-primary,
            body.mode-reset-otp .btn-primary {
                background: linear-gradient(135deg, #3b82f6, #2563eb) !important;
                box-shadow: 0 10px 22px rgba(59, 130, 246, 0.24);
            }

            .divider {
                margin: 12px 0;
            }

            .divider::before,
            .divider::after { background: #d7ddee; }

            .divider span {
                color: #8a94a8;
                font-size: 10px;
                letter-spacing: 0.08em;
            }

            .btn-passkey {
                font-size: 12px;
                padding: 10px 11px;
                border-radius: 10px;
                border-color: #d7ddef;
                background: #ffffff;
                color: #1f2937;
            }

            .btn-passkey:hover {
                border-color: #c4cde5;
                background: #f5f7ff;
                box-shadow: 0 4px 12px rgba(99, 102, 241, 0.12);
            }

            .otp-inline {
                background: #f8faff;
                border: 1px solid #dbe2f3;
                border-radius: 12px;
                padding: 12px 10px 8px;
                margin-top: 8px;
            }

            .otp-inline .otp-info {
                font-size: 11px;
                color: #64748b;
                margin-bottom: 9px;
            }

            .otp-inline .otp-info strong { color: #111827; }

            .otp-input {
                width: 36px;
                height: 44px;
                font-size: 17px;
                border-radius: 10px;
                border-color: #d7deef;
                background: #ffffff;
                color: #111827;
            }

            .otp-input:focus,
            body.mode-signup .otp-input:focus,
            body.mode-reset-otp .otp-input:focus {
                border-color: #6366f1;
                box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.18);
                background: #ffffff;
            }

            .otp-inputs { gap: 5px; }

            #forgotSection .otp-info,
            #resetOtpPrompt {
                color: #64748b !important;
                font-size: 12px !important;
            }

            #resetVerifiedInfo {
                color: #4f46e5 !important;
                font-size: 12px !important;
            }

            .bottom-row {
                margin-top: 14px;
                gap: 6px;
                flex-direction: row;
                justify-content: center;
                align-items: center;
                font-size: 11px;
            }

            .bottom-row .info-text { color: #8a94a8; }

            .bottom-row .switch-link {
                width: auto;
                padding: 0;
                border: none;
                border-radius: 0;
                background: transparent;
                color: #4f46e5;
                font-size: 11px;
                font-weight: 600;
            }

            body.mode-login .bottom-row .switch-link { color: #e8583e !important; }
            body.mode-signup .bottom-row .switch-link { color: #0d9e6d !important; }
            body.mode-forgot .bottom-row .switch-link,
            body.mode-reset-otp .bottom-row .switch-link { color: #3b6ade !important; }

            .bottom-row .switch-link:hover {
                text-decoration: underline;
                background: transparent;
                border-color: transparent;
            }

            body.mode-login .bottom-row .switch-link:hover { color: #cc492f !important; }
            body.mode-signup .bottom-row .switch-link:hover { color: #087e57 !important; }
            body.mode-forgot .bottom-row .switch-link:hover,
            body.mode-reset-otp .bottom-row .switch-link:hover { color: #2f58bc !important; }

            .btn-link {
                color: #3b6ade !important;
                font-size: 11px;
                margin-top: 12px;
                display: block;
                text-align: center;
                width: auto;
                font-weight: 600;
            }

            .btn-link:hover {
                color: #2f58bc;
                text-decoration: underline;
            }

            .msg {
                font-size: 11px;
                padding: 10px 12px;
                border-radius: 10px;
            }

            .msg.error {
                background: #fff1f2;
                border-color: #fecdd3;
                color: #be123c;
            }

            .msg.success {
                background: #ecfdf3;
                border-color: #bbf7d0;
                color: #15803d;
            }

            .footer {
                margin-top: 12px;
                font-size: 10px;
                color: #8a94a8;
            }

            .footer::before {
                content: "";
                display: block;
                width: min(66vw, 240px);
                height: 3px;
                margin: 0 auto 8px;
                border-radius: 999px;
                background: linear-gradient(
                    90deg,
                    rgba(255, 255, 255, 0) 0%,
                    rgba(255, 255, 255, 0.55) 16%,
                    rgba(255, 255, 255, 1) 50%,
                    rgba(255, 255, 255, 0.55) 84%,
                    rgba(255, 255, 255, 0) 100%
                );
                box-shadow: 0 0 10px rgba(255, 255, 255, 0.7);
            }

            .footer a { color: #4f46e5; }
            .footer a:hover { color: #4338ca; }
        }

        @media (max-width: 400px) {
            .auth-container { padding: calc(12px + env(safe-area-inset-top)) 8px calc(12px + env(safe-area-inset-bottom)) !important; }
            .auth-card { border-radius: 18px; }
            .form-panel { padding: 20px 14px 14px; }
            .form-header h1 { font-size: 19px; }
            .form-header .subtitle { font-size: 10px; }
            .otp-input { width: 31px; height: 38px; font-size: 16px; border-radius: 8px; }
            .otp-inputs { gap: 4px; }
            .btn-primary { padding: 10px; font-size: 13px; border-radius: 13px; }
            .input-field { padding: 10px 11px; font-size: 16px; border-radius: 13px; }
            .form-group label { font-size: 10px; margin-bottom: 5px; }
            .form-group { margin-bottom: 10px; }
            .bottom-row .switch-link { font-size: 10px; }
            .bottom-row .info-text,
            .forgot-link,
            .btn-link { font-size: 10px; }
        }

        @media (max-width: 340px) {
            .auth-container { padding: calc(10px + env(safe-area-inset-top)) 6px calc(10px + env(safe-area-inset-bottom)) !important; }
            .form-panel { padding: 16px 10px 12px; }
            .otp-input { width: 28px; height: 34px; font-size: 14px; border-radius: 7px; }
            .otp-inputs { gap: 3px; }
            .form-header h1 { font-size: 17px; }
            .bottom-row { gap: 6px; }
            .bottom-row .switch-link { font-size: 9px; }
            .input-field { font-size: 16px; }
            .form-group label { font-size: 9px; }
            .btn-primary { font-size: 10px; }
        }