/* ============================================================
   FREUMIA TEACHERS AI
   TEACHER LOGIN STYLESHEET
   ------------------------------------------------------------
   Architecture:
   - Shared visual language with teachers-signup.css
   - No JavaScript logic in CSS
   - Responsive/mobile-first behavior
   ============================================================ */

/* ============================================================
   1. ROOT VARIABLES
   ============================================================ */

:root {
    --bg-primary: #07111f;
    --bg-secondary: #0b1728;
    --bg-card: #0f1d30;
    --bg-card-soft: #13243a;

    --text-primary: #f8fafc;
    --text-secondary: #aab8c8;
    --text-muted: #718096;
    --text-dark: #172033;

    --border-dark: rgba(255, 255, 255, 0.09);
    --border-focus: rgba(91, 140, 255, 0.55);

    --primary: #5b8cff;
    --primary-dark: #3f6fe8;
    --primary-soft: rgba(91, 140, 255, 0.12);

    --success: #22c55e;
    --success-soft: rgba(34, 197, 94, 0.12);

    --warning: #f59e0b;
    --warning-soft: rgba(245, 158, 11, 0.12);

    --danger: #ef4444;
    --danger-soft: rgba(239, 68, 68, 0.12);

    --white: #ffffff;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 24px;

    --shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.16);
    --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.24);

    --transition: 180ms ease;
}

/* ============================================================
   2. RESET
   ============================================================ */

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    min-height: 100%;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family:
        Inter,
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;
    color: var(--text-primary);
    background:
        radial-gradient(
            circle at top left,
            rgba(91, 140, 255, 0.12),
            transparent 32%
        ),
        linear-gradient(
            135deg,
            #07111f 0%,
            #091625 45%,
            #07111f 100%
        );
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

button,
input {
    font: inherit;
}

button {
    cursor: pointer;
}

button:disabled {
    cursor: not-allowed;
}

a {
    color: inherit;
    text-decoration: none;
}

h1,
h2,
p {
    margin-top: 0;
}

[hidden] {
    display: none !important;
}

/* ============================================================
   3. APPLICATION
   ============================================================ */

.teacher-login-app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ============================================================
   4. HEADER
   ============================================================ */

.login-header {
    width: 100%;
    min-height: 72px;
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    border-bottom: 1px solid var(--border-dark);
    background: rgba(7, 17, 31, 0.82);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    position: sticky;
    top: 0;
    z-index: 50;
}

.login-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
}

.brand-logo {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    flex: 0 0 42px;
    border-radius: 12px;
    background: linear-gradient(
        135deg,
        rgba(91, 140, 255, 0.22),
        rgba(91, 140, 255, 0.07)
    );
    border: 1px solid rgba(91, 140, 255, 0.25);
    font-size: 21px;
}

.brand-content {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.brand-name {
    font-size: 16px;
    line-height: 1.2;
    letter-spacing: 0.08em;
}

.brand-subtitle {
    color: var(--text-secondary);
    font-size: 11px;
    line-height: 1.2;
    margin-top: 2px;
}

.create-account-link {
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 600;
    white-space: nowrap;
    transition: color var(--transition), transform var(--transition);
}

.create-account-link:hover {
    color: var(--white);
    transform: translateX(2px);
}

.create-account-link:focus-visible,
a:focus-visible,
button:focus-visible,
input:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 3px;
}

/* ============================================================
   5. MAIN
   ============================================================ */

.login-main {
    width: 100%;
    max-width: 920px;
    margin: 0 auto;
    padding: 52px 20px 70px;
    flex: 1;
}

/* ============================================================
   6. INTRODUCTION
   ============================================================ */

.login-introduction {
    max-width: 720px;
    margin: 0 auto 30px;
    text-align: center;
}

.login-eyebrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 28px;
    padding: 5px 12px;
    border-radius: 999px;
    background: var(--primary-soft);
    border: 1px solid rgba(91, 140, 255, 0.22);
    color: #a9c1ff;
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.12em;
}

.login-introduction h1 {
    margin: 14px 0 10px;
    font-size: clamp(28px, 5vw, 42px);
    line-height: 1.12;
    letter-spacing: -0.035em;
}

.login-introduction p {
    max-width: 650px;
    margin: 0 auto;
    color: var(--text-secondary);
    font-size: clamp(14px, 2vw, 16px);
}

/* ============================================================
   7. LOGIN CARD
   ============================================================ */

.login-card,
.password-reset-panel {
    width: 100%;
    background:
        linear-gradient(
            180deg,
            rgba(15, 29, 48, 0.98),
            rgba(11, 23, 40, 0.98)
        );
    border: 1px solid var(--border-dark);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.login-card {
    padding: 30px;
}

.login-card-header,
.reset-panel-header {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    margin-bottom: 24px;
}

.login-card-icon,
.reset-panel-icon {
    width: 46px;
    height: 46px;
    flex: 0 0 46px;
    display: grid;
    place-items: center;
    border-radius: 14px;
    background: rgba(91, 140, 255, 0.10);
    border: 1px solid rgba(91, 140, 255, 0.20);
    font-size: 20px;
}

.card-eyebrow {
    margin: 0 0 3px;
    color: #a9c1ff;
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.12em;
}

.login-card-header h2,
.reset-panel-header h2 {
    margin: 0 0 5px;
    font-size: clamp(20px, 3vw, 24px);
    line-height: 1.25;
    letter-spacing: -0.02em;
}

.login-card-header p:not(.card-eyebrow),
.reset-panel-header p:not(.card-eyebrow) {
    margin: 0;
    color: var(--text-secondary);
    font-size: 13px;
}

/* ============================================================
   8. STATUS MESSAGES
   ============================================================ */

.login-status {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 15px;
    margin-bottom: 20px;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
}

.status-icon {
    width: 28px;
    height: 28px;
    flex: 0 0 28px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    font-weight: 800;
    font-size: 13px;
}

.login-status strong {
    display: block;
    margin-bottom: 2px;
    font-size: 13px;
}

.login-status p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 12px;
    line-height: 1.5;
}

.login-error {
    background: var(--danger-soft);
    border-color: rgba(239, 68, 68, 0.22);
}

.login-error .status-icon {
    background: rgba(239, 68, 68, 0.16);
    color: #fca5a5;
}

.login-success {
    background: var(--success-soft);
    border-color: rgba(34, 197, 94, 0.22);
}

.login-success .status-icon {
    background: rgba(34, 197, 94, 0.16);
    color: #86efac;
}

/* ============================================================
   9. FORM
   ============================================================ */

.teacher-login-form,
.password-reset-form {
    width: 100%;
}

.form-field {
    margin-bottom: 20px;
}

.form-field > label,
.field-label-row label {
    display: block;
    margin-bottom: 8px;
    color: #dce6f2;
    font-size: 12px;
    font-weight: 700;
}

.field-label-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 8px;
}

.field-label-row label {
    margin-bottom: 0;
}

.form-field input {
    width: 100%;
    min-height: 50px;
    padding: 13px 14px;
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.035);
    border: 1px solid rgba(255, 255, 255, 0.10);
    border-radius: var(--radius-md);
    outline: none;
    transition:
        border-color var(--transition),
        background var(--transition),
        box-shadow var(--transition);
}

.form-field input::placeholder {
    color: #65758a;
}

.form-field input:hover {
    border-color: rgba(255, 255, 255, 0.16);
}

.form-field input:focus {
    background: rgba(255, 255, 255, 0.045);
    border-color: var(--border-focus);
    box-shadow: 0 0 0 4px rgba(91, 140, 255, 0.08);
}

.form-field input.field-invalid,
.form-field input[aria-invalid="true"] {
    border-color: rgba(239, 68, 68, 0.60);
    box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.07);
}

.password-field {
    position: relative;
}

.password-field input {
    padding-right: 74px;
}

.password-toggle,
.forgot-password-button {
    border: 0;
    background: transparent;
    color: #a9c1ff;
    font-size: 12px;
    font-weight: 700;
}

.password-toggle {
    position: absolute;
    top: 50%;
    right: 12px;
    transform: translateY(-50%);
    padding: 6px;
}

.password-toggle:hover,
.forgot-password-button:hover {
    color: var(--white);
}

.forgot-password-button {
    padding: 0;
    white-space: nowrap;
}

.field-error {
    margin: 7px 0 0;
    color: #fca5a5;
    font-size: 11px;
    line-height: 1.45;
}

/* ============================================================
   10. OPTIONS
   ============================================================ */

.login-options {
    margin: -2px 0 20px;
}

.remember-option {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    color: var(--text-secondary);
    font-size: 12px;
    cursor: pointer;
    user-select: none;
}

.remember-option input {
    width: 15px;
    height: 15px;
    margin: 0;
    accent-color: var(--primary);
}

/* ============================================================
   11. PRIMARY SUBMIT
   ============================================================ */

.teacher-login-submit,
.primary-button {
    width: 100%;
    min-height: 52px;
    border: 1px solid rgba(91, 140, 255, 0.40);
    border-radius: var(--radius-md);
    background: linear-gradient(
        135deg,
        var(--primary),
        var(--primary-dark)
    );
    color: var(--white);
    font-weight: 800;
    font-size: 13px;
    box-shadow: 0 10px 24px rgba(63, 111, 232, 0.20);
    transition:
        transform var(--transition),
        box-shadow var(--transition),
        filter var(--transition);
}

.teacher-login-submit {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
}

.teacher-login-submit:hover:not(:disabled),
.primary-button:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 14px 28px rgba(63, 111, 232, 0.28);
    filter: brightness(1.04);
}

.teacher-login-submit:active:not(:disabled),
.primary-button:active:not(:disabled) {
    transform: translateY(0);
}

.teacher-login-submit:disabled,
.primary-button:disabled {
    opacity: 0.58;
    box-shadow: none;
}

.submit-arrow {
    font-size: 16px;
    line-height: 1;
}

.submit-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.38);
    border-top-color: var(--white);
    border-radius: 50%;
    animation: loginSpinner 700ms linear infinite;
}

@keyframes loginSpinner {
    to {
        transform: rotate(360deg);
    }
}

/* ============================================================
   12. DIVIDER
   ============================================================ */

.form-divider {
    display: flex;
    align-items: center;
    gap: 14px;
    margin: 24px 0;
    color: var(--text-muted);
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.12em;
}

.form-divider::before,
.form-divider::after {
    content: "";
    flex: 1;
    height: 1px;
    background: var(--border-dark);
}

/* ============================================================
   13. GOOGLE LOGIN
   ============================================================ */

.google-login-button {
    width: 100%;
    min-height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 12px 16px;
    border: 1px solid rgba(255, 255, 255, 0.11);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.035);
    color: var(--text-primary);
    font-size: 13px;
    font-weight: 700;
    transition:
        background var(--transition),
        border-color var(--transition),
        transform var(--transition);
}

.google-login-button:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.18);
    transform: translateY(-1px);
}

.google-login-button:disabled {
    opacity: 0.58;
}

.oauth-icon {
    width: 28px;
    height: 28px;
    display: grid;
    place-items: center;
    flex: 0 0 28px;
    border-radius: 50%;
    background: var(--white);
    color: #4285f4;
    font-weight: 900;
    font-size: 14px;
}

/* ============================================================
   14. CREATE ACCOUNT
   ============================================================ */

.create-account-prompt {
    margin: 20px 0 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 12px;
}

.create-account-prompt a {
    color: #a9c1ff;
    font-weight: 800;
}

.create-account-prompt a:hover {
    color: var(--white);
    text-decoration: underline;
    text-underline-offset: 3px;
}

/* ============================================================
   15. PASSWORD RESET
   ============================================================ */

.password-reset-panel {
    margin-top: 18px;
    padding: 26px 30px;
}

.reset-panel-header {
    margin-bottom: 22px;
}

.reset-actions {
    display: grid;
    grid-template-columns: 1fr 1.4fr;
    gap: 12px;
    margin-top: 6px;
}

.secondary-button,
.primary-button {
    min-height: 48px;
    padding: 10px 16px;
    border-radius: var(--radius-md);
    font-size: 12px;
    font-weight: 800;
}

.secondary-button {
    border: 1px solid rgba(255, 255, 255, 0.10);
    background: rgba(255, 255, 255, 0.035);
    color: var(--text-secondary);
    transition:
        background var(--transition),
        border-color var(--transition),
        color var(--transition);
}

.secondary-button:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.18);
    color: var(--white);
}

.reset-message {
    margin: 14px 0 0;
    padding: 11px 12px;
    border-radius: var(--radius-sm);
    background: var(--success-soft);
    border: 1px solid rgba(34, 197, 94, 0.20);
    color: #bbf7d0;
    font-size: 12px;
}

/* ============================================================
   16. TRUST CARDS
   ============================================================ */

.login-trust-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin-top: 18px;
}

.trust-card {
    min-width: 0;
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 16px;
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-md);
    background: rgba(15, 29, 48, 0.72);
}

.trust-icon {
    width: 30px;
    height: 30px;
    display: grid;
    place-items: center;
    flex: 0 0 30px;
    border-radius: 9px;
    background: rgba(91, 140, 255, 0.08);
    font-size: 14px;
}

.trust-card strong {
    display: block;
    margin-bottom: 3px;
    color: #dce6f2;
    font-size: 11px;
    line-height: 1.3;
}

.trust-card p {
    margin: 0;
    color: var(--text-muted);
    font-size: 10px;
    line-height: 1.45;
}

/* ============================================================
   17. FOOTER
   ============================================================ */

.login-footer {
    padding: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    text-align: center;
}

.login-footer p {
    margin: 0;
    color: var(--text-muted);
    font-size: 10px;
}

/* ============================================================
   18. RESPONSIVE — TABLET
   ============================================================ */

@media (max-width: 760px) {

    .login-main {
        max-width: 680px;
        padding: 38px 16px 54px;
    }

    .login-card {
        padding: 24px;
    }

    .login-trust-grid {
        grid-template-columns: 1fr;
    }

}

/* ============================================================
   19. RESPONSIVE — MOBILE
   ============================================================ */

@media (max-width: 520px) {

    .login-header {
        min-height: 64px;
        padding: 12px 14px;
        gap: 12px;
    }

    .brand-logo {
        width: 38px;
        height: 38px;
        flex-basis: 38px;
        font-size: 18px;
    }

    .brand-name {
        font-size: 14px;
    }

    .brand-subtitle {
        font-size: 10px;
    }

    .create-account-link {
        font-size: 11px;
    }

    .login-main {
        padding: 32px 12px 46px;
    }

    .login-introduction {
        margin-bottom: 22px;
    }

    .login-introduction h1 {
        font-size: 30px;
    }

    .login-introduction p {
        font-size: 13px;
    }

    .login-card,
    .password-reset-panel {
        border-radius: 18px;
    }

    .login-card {
        padding: 20px 16px;
    }

    .password-reset-panel {
        padding: 20px 16px;
    }

    .login-card-header,
    .reset-panel-header {
        gap: 10px;
        margin-bottom: 20px;
    }

    .login-card-icon,
    .reset-panel-icon {
        width: 40px;
        height: 40px;
        flex-basis: 40px;
        font-size: 17px;
    }

    .login-card-header h2,
    .reset-panel-header h2 {
        font-size: 19px;
    }

    .login-card-header p:not(.card-eyebrow),
    .reset-panel-header p:not(.card-eyebrow) {
        font-size: 12px;
    }

    .field-label-row {
        align-items: flex-start;
    }

    .forgot-password-button {
        font-size: 11px;
    }

    .reset-actions {
        grid-template-columns: 1fr;
    }

    .trust-card {
        padding: 14px;
    }

}

/* ============================================================
   20. REDUCED MOTION
   ============================================================ */

@media (prefers-reduced-motion: reduce) {

    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

  }