/* ===== Variables ===== */
:root {
    --primary: #059669;
    --primary-dark: #047857;
    --primary-light: #d1fae5;
    --bg: #ecfdf5;
    --card: #ffffff;
    --text: #064e3b;
    --text-2: #065f46;
    --text-3: #6b7280;
    --border: #d1fae5;
    --shadow: 0 20px 50px rgba(6, 78, 59, 0.15);
    --radius: 24px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html, body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    background: var(--bg);
    min-height: 100vh;
    min-height: 100dvh;
    color: var(--text);
}

.hidden { display: none !important; }

/* ===== Login Page ===== */
.login-page {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    padding: 24px;
}

.login-top {
    text-align: center;
    padding: 40px 0 32px;
}

.brand-mark {
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border-radius: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    font-weight: 800;
    letter-spacing: 2px;
    box-shadow: 0 10px 30px rgba(5, 150, 105, 0.3);
}

.brand-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}

.brand-subtitle {
    font-size: 14px;
    color: var(--text-2);
    letter-spacing: 1px;
}

/* ===== Login Card ===== */
.login-card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 32px 24px;
    box-shadow: var(--shadow);
    max-width: 420px;
    width: 100%;
    margin: 0 auto auto;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-2);
}

.form-input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border);
    border-radius: 14px;
    font-size: 16px;
    color: var(--text);
    background: #fafffd;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(5, 150, 105, 0.1);
}

.login-btn {
    width: 100%;
    padding: 16px;
    margin-top: 8px;
    border: none;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    font-size: 17px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s;
    box-shadow: 0 8px 24px rgba(5, 150, 105, 0.3);
}

.login-btn:active {
    transform: scale(0.98);
}

.login-btn:disabled {
    opacity: 0.7;
    cursor: wait;
}

.error-msg {
    margin-top: 16px;
    padding: 12px;
    background: #fee2e2;
    color: #b91c1c;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
    text-align: center;
}

.login-hint {
    margin-top: 20px;
    text-align: center;
    font-size: 13px;
    color: var(--text-3);
}

.login-hint strong {
    color: var(--text-2);
    font-weight: 600;
}

/* ===== Desktop ===== */
@media (min-width: 768px) {
    .login-page {
        justify-content: center;
        padding: 40px;
    }

    .login-top {
        padding-bottom: 40px;
    }

    .brand-title {
        font-size: 30px;
    }

    .login-card {
        padding: 40px;
    }
}