* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
        body {
            font-family: var(--font-sans);
            background-color: var(--bg-page);
            background-image: var(--bg-pattern);
            background-size: var(--bg-pattern-size, auto);
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            min-height: 100dvh;
            min-height: var(--app-viewport-height, 100dvh);
            padding: max(20px, env(safe-area-inset-top, 0px)) max(20px, env(safe-area-inset-right, 0px)) max(20px, env(safe-area-inset-bottom, 0px)) max(20px, env(safe-area-inset-left, 0px));
            overflow-x: hidden;
        }
        .login-card {
            width: 100%;
            max-width: 420px;
            background: var(--card-bg, #ffffff);
            padding: 42px 36px 36px;
            border-radius: var(--card-radius, 16px);
            box-shadow: 0 24px 60px rgba(10, 22, 38, 0.25);
            border: var(--card-border, 1px solid var(--border-color));
            position: relative;
            overflow: hidden;
        }
        .login-card::before {
            content: "";
            position: absolute;
            top: 0; left: 0; right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary) 0%, var(--seal-color) 50%, var(--success) 100%);
        }
        .login-header {
            text-align: center;
            margin-bottom: 28px;
        }
        .seal-mark {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            border: 2px solid var(--seal-color);
            border-radius: 10px;
            color: var(--seal-color);
            font-family: var(--font-serif);
            font-size: 20px;
            font-weight: 700;
            background: var(--seal-bg);
            margin-bottom: 12px;
            box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.06);
        }
        .login-title {
            font-family: var(--font-serif);
            font-size: 22px;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: 0.8px;
            margin-bottom: 6px;
            line-height: 1.25;
            text-wrap: balance;
        }
        .login-sub {
            font-family: var(--font-serif);
            font-size: 13px;
            color: var(--text-muted);
            letter-spacing: 1px;
        }
        .form-item { margin-bottom: 20px; }
        .form-item label {
            display: block;
            font-size: 13.5px;
            color: var(--text-regular);
            margin-bottom: 7px;
            font-family: var(--font-serif);
            font-weight: 600;
        }
        .form-item input {
            width: 100%;
            height: 44px;
            padding: 0 14px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 16px;
            outline: none;
            transition: color .25s ease, background-color .25s ease, border-color .25s ease, box-shadow .25s ease;
            color: var(--text-main);
            background: var(--card-bg);
        }
        .form-item input:focus,
        .form-item input:focus-visible {
            border-color: var(--primary);
            box-shadow: var(--focus-ring);
            outline: none;
        }
        .form-item input[aria-invalid="true"] {
            border-color: var(--danger) !important;
            background: var(--danger-surface);
        }
        .pw-wrap {
            position: relative;
            display: flex;
            align-items: center;
        }
        .pw-wrap input {
            padding-right: 48px;
        }
        .eye-toggle-btn {
            position: absolute;
            right: 2px;
            top: 50%;
            transform: translateY(-50%);
            background: transparent;
            border: none;
            width: 44px;
            height: 44px;
            min-width: 44px;
            min-height: 44px;
            padding: 0;
            cursor: pointer;
            color: var(--text-muted);
            font-size: 18px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 6px;
            transition: color .2s ease, background-color .2s ease;
        }
        @media (hover: hover) and (pointer: fine) {
            .eye-toggle-btn:hover {
                color: var(--primary);
                background: var(--tag-bg);
            }
        }
        .form-error {
            display: none;
            margin: -4px 0 16px;
            padding: 10px 12px;
            border: 1px solid var(--danger-border);
            border-radius: 8px;
            background: var(--danger-surface);
            color: var(--danger);
            font-size: 13px;
            line-height: 1.5;
            text-align: left;
        }
        .form-error.is-visible { display: block; }
        .login-btn {
            width: 100%;
            height: 46px;
            background: var(--btn-primary-bg);
            color: #fff;
            border: none;
            border-radius: 8px;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: opacity .25s ease, background-color .25s ease, box-shadow .25s ease, transform .25s ease;
            box-shadow: var(--btn-primary-shadow);
            font-family: var(--font-serif);
            letter-spacing: 2px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
        }
        .login-btn:focus-visible,
        .eye-toggle-btn:focus-visible,
        .quote-foot a:focus-visible {
            outline: 3px solid var(--primary);
            outline-offset: 2px;
        }
        @media (hover: hover) and (pointer: fine) {
            .login-btn:hover {
                opacity: 0.96;
                transform: translateY(-1px);
            }
        }
        .login-btn:active {
            opacity: 0.92;
            transform: translateY(0);
        }
        .login-btn:disabled {
            opacity: 0.72;
            cursor: not-allowed;
            transform: none;
        }
        .quote-foot {
            margin-top: 24px;
            padding-top: 16px;
            border-top: 1px solid var(--border-subtle);
            text-align: center;
            font-size: 12px;
            color: var(--text-light);
            font-family: var(--font-serif);
            letter-spacing: 0.5px;
            line-height: 1.65;
        }
        .quote-foot a {
            color: var(--primary);
            font-weight: 600;
            text-decoration: none;
            border-radius: 4px;
        }
        .quote-foot a:hover {
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        html.is-app-environment #studentAppDownloadEntry {
            display: none !important;
        }
        #studentAppDownloadEntry[hidden] {
            display: none !important;
        }
        @media (max-width: 420px) {
            body {
                padding-left: max(14px, env(safe-area-inset-left, 0px));
                padding-right: max(14px, env(safe-area-inset-right, 0px));
            }
            .login-card {
                padding: 36px 24px 30px;
            }
        }
        @media (max-width: 420px) and (max-height: 700px) {
            body {
                align-items: flex-start;
                padding-top: max(14px, env(safe-area-inset-top, 0px));
                padding-bottom: max(14px, env(safe-area-inset-bottom, 0px));
            }
            .login-card {
                padding-top: 30px;
                padding-bottom: 26px;
            }
            .login-header {
                margin-bottom: 22px;
            }
            .form-item {
                margin-bottom: 16px;
            }
            .quote-foot {
                margin-top: 20px;
                padding-top: 13px;
            }
        }
        @media (prefers-reduced-motion: reduce) {
            .login-btn,
            .eye-toggle-btn {
                transition: none;
            }
        }