@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=DM+Sans:wght@300;400;500;600;700&display=swap');

:root {
    --ink: oklch(17% 0.018 55);
    --ink-strong: oklch(12% 0.02 55);
    --canvas-start: oklch(98% 0.016 68);
    --canvas-mid: oklch(91% 0.03 72);
    --canvas-end: oklch(83% 0.055 51);
    --paper: oklch(96% 0.014 64);
    --paper-warm: oklch(91% 0.026 70);
    --surface: oklch(99% 0.01 67);
    --surface-strong: oklch(94% 0.018 68);
    --line: oklch(78% 0.032 67);
    --muted: oklch(45% 0.028 60);
    --copper: oklch(64% 0.19 42);
    --copper-deep: oklch(39% 0.14 39);
    --olive: oklch(43% 0.07 112);
    --gold: oklch(78% 0.135 78);
    --error: oklch(55% 0.18 28);
    --success: oklch(50% 0.12 145);
    --shadow: 0 24px 70px oklch(18% 0.03 55 / 0.2);
    --grid-line: oklch(35% 0.05 55 / 0.055);
    --grid-line-strong: oklch(35% 0.05 55 / 0.045);
    --brand-surface: var(--surface);
    --brand-border: oklch(78% 0.03 65);
    --brand-shadow: 0 12px 32px oklch(18% 0.03 55 / 0.14);
    --chip-bg: oklch(95% 0.035 78 / 0.72);
    --chip-border: oklch(70% 0.07 75);
    --chip-text: oklch(31% 0.065 67);
    --panel-bg: linear-gradient(150deg, oklch(99% 0.012 68) 0%, oklch(96% 0.02 70) 52%, oklch(92% 0.034 57) 100%);
    --panel-inner-line: oklch(74% 0.06 65 / 0.45);
    --field-bg: oklch(99% 0.01 68);
    --field-border: oklch(72% 0.035 64);
    --field-placeholder: oklch(60% 0.025 60);
    --field-inner-shadow: inset 0 1px 0 oklch(100% 0.005 70 / 0.8);
    --secondary-bg: oklch(93% 0.035 77);
    --secondary-bg-hover: oklch(88% 0.055 73);
    --secondary-text: oklch(34% 0.08 54);
    --secondary-border: oklch(72% 0.07 70);
    --quiet-link-bg: oklch(98% 0.012 68 / 0.72);
    --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
    --ease-out-quint: cubic-bezier(0.22, 1, 0.36, 1);
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    color-scheme: light;
}

:root[data-theme="dark"] {
    --ink: oklch(88% 0.018 68);
    --ink-strong: oklch(96% 0.012 68);
    --canvas-start: oklch(17% 0.028 54);
    --canvas-mid: oklch(13% 0.026 48);
    --canvas-end: oklch(20% 0.065 38);
    --paper: oklch(20% 0.025 54);
    --paper-warm: oklch(24% 0.035 52);
    --surface: oklch(22% 0.024 55);
    --surface-strong: oklch(27% 0.033 55);
    --line: oklch(42% 0.05 58);
    --muted: oklch(72% 0.028 68);
    --copper: oklch(70% 0.16 48);
    --copper-deep: oklch(78% 0.13 58);
    --olive: oklch(68% 0.07 116);
    --gold: oklch(80% 0.12 78);
    --error: oklch(68% 0.15 28);
    --success: oklch(70% 0.11 145);
    --shadow: 0 28px 80px oklch(7% 0.02 45 / 0.58);
    --grid-line: oklch(88% 0.02 65 / 0.055);
    --grid-line-strong: oklch(88% 0.02 65 / 0.035);
    --brand-surface: oklch(94% 0.01 65);
    --brand-border: oklch(54% 0.07 58);
    --brand-shadow: 0 18px 44px oklch(7% 0.02 45 / 0.38);
    --chip-bg: oklch(28% 0.055 54 / 0.72);
    --chip-border: oklch(58% 0.11 58);
    --chip-text: oklch(87% 0.06 72);
    --panel-bg: linear-gradient(150deg, oklch(21% 0.026 55) 0%, oklch(16% 0.025 52) 56%, oklch(24% 0.055 41) 100%);
    --panel-inner-line: oklch(58% 0.08 58 / 0.42);
    --field-bg: oklch(17% 0.022 54);
    --field-border: oklch(45% 0.05 58);
    --field-placeholder: oklch(63% 0.025 66);
    --field-inner-shadow: inset 0 1px 0 oklch(100% 0.005 70 / 0.05);
    --secondary-bg: oklch(28% 0.05 55);
    --secondary-bg-hover: oklch(35% 0.065 55);
    --secondary-text: oklch(86% 0.055 72);
    --secondary-border: oklch(56% 0.08 62);
    --quiet-link-bg: oklch(23% 0.03 55 / 0.78);
    color-scheme: dark;
}

* {
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    margin: 0;
    background:
        linear-gradient(135deg, var(--canvas-start) 0%, var(--canvas-mid) 46%, var(--canvas-end) 100%);
    color: var(--ink);
    font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-weight: 400;
    transition: background 280ms var(--ease-out-quart), color 220ms var(--ease-out-quart);
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    background-image:
        linear-gradient(var(--grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-line-strong) 1px, transparent 1px);
    background-size: 44px 44px;
    mask-image: linear-gradient(120deg, black 0%, transparent 78%);
    opacity: 0;
    animation: gridReveal 520ms var(--ease-out-quart) 80ms forwards;
    transition: background-image 280ms var(--ease-out-quart), opacity 220ms var(--ease-out-quart);
}

.auth-shell {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: grid;
    grid-template-columns: minmax(0, 1.08fr) minmax(360px, 440px);
    align-items: center;
    gap: clamp(2rem, 6vw, 5.5rem);
    width: min(1120px, calc(100% - 48px));
    margin: 0 auto;
    padding: 56px 0;
}

@keyframes gridReveal {
    from {
        opacity: 0;
        transform: translate3d(0, 8px, 0);
    }

    to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
    }
}

@keyframes authRise {
    from {
        opacity: 0;
        transform: translate3d(0, 18px, 0);
    }

    to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
    }
}

@keyframes authPanelIn {
    from {
        opacity: 0;
        transform: translate3d(18px, 0, 0) scale(0.985);
    }

    to {
        opacity: 1;
        transform: translate3d(0, 0, 0) scale(1);
    }
}

@keyframes chipIn {
    from {
        opacity: 0;
        transform: translate3d(0, 10px, 0);
    }

    to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
    }
}

@keyframes messageIn {
    from {
        opacity: 0;
        transform: translate3d(0, -4px, 0);
    }

    to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
    }
}

.theme-switch {
    position: absolute;
    top: 28px;
    right: 0;
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    gap: 9px;
    padding: 8px 12px;
    background: var(--quiet-link-bg);
    color: var(--secondary-text);
    border: 1px solid var(--secondary-border);
    border-radius: 999px;
    box-shadow: 0 12px 28px oklch(18% 0.03 55 / 0.12);
    font-size: 0.78rem;
    font-weight: 900;
    opacity: 0;
    animation: authRise 360ms var(--ease-out-quart) 220ms forwards;
    transition:
        transform 160ms var(--ease-out-quart),
        background 220ms var(--ease-out-quart),
        color 220ms var(--ease-out-quart),
        border-color 220ms var(--ease-out-quart),
        box-shadow 220ms var(--ease-out-quart);
}

.theme-switch:hover {
    background: var(--secondary-bg-hover);
    transform: translateY(-1px);
}

.theme-switch:active {
    transform: translateY(0) scale(0.98);
}

.theme-switch-icon {
    width: 14px;
    height: 14px;
    border-radius: 999px;
    background: var(--copper);
    box-shadow: inset -4px -2px 0 oklch(99% 0.01 67 / 0.72);
    transition: background 220ms var(--ease-out-quart), box-shadow 220ms var(--ease-out-quart), transform 220ms var(--ease-out-quart);
}

:root[data-theme="dark"] .theme-switch-icon {
    box-shadow: inset 4px 0 0 oklch(20% 0.025 54);
    transform: rotate(-22deg);
}

.auth-shell-register {
    grid-template-columns: minmax(0, 0.92fr) minmax(390px, 520px);
}

.auth-intro {
    max-width: 620px;
}

.auth-intro > * {
    opacity: 0;
    animation: authRise 520ms var(--ease-out-quint) forwards;
}

.auth-intro .brand-mark {
    animation-delay: 40ms;
}

.auth-intro .eyebrow {
    animation-delay: 110ms;
}

.auth-intro h1 {
    animation-delay: 170ms;
}

.auth-intro .intro-copy {
    animation-delay: 240ms;
}

.auth-intro .trust-row {
    animation-delay: 300ms;
}

.brand-mark {
    display: inline-flex;
    width: 82px;
    height: 82px;
    align-items: center;
    justify-content: center;
    margin-bottom: 36px;
    border-radius: 999px;
    background: var(--brand-surface);
    border: 1px solid var(--brand-border);
    box-shadow: var(--brand-shadow);
    transition: transform 190ms var(--ease-out-quart), background 240ms var(--ease-out-quart), border-color 240ms var(--ease-out-quart), box-shadow 240ms var(--ease-out-quart);
    will-change: transform;
}

.brand-mark:hover {
    transform: translate3d(0, -2px, 0);
}

.login-logo {
    width: 66px;
    height: 66px;
    object-fit: contain;
    border-radius: 999px;
}

.eyebrow,
.panel-kicker {
    margin: 0;
    color: var(--copper-deep);
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.auth-intro h1 {
    max-width: 11ch;
    margin: 14px 0 20px;
    color: var(--ink-strong);
    font-family: 'DM Serif Display', Georgia, serif;
    font-size: clamp(3.25rem, 8vw, 6.4rem);
    font-weight: 400;
    letter-spacing: 0;
    line-height: 0.88;
}

.auth-shell-register .auth-intro h1 {
    max-width: 12ch;
    font-size: clamp(3rem, 7vw, 5.8rem);
}

.intro-copy {
    max-width: 58ch;
    margin: 0;
    color: var(--muted);
    font-size: 1.04rem;
    line-height: 1.7;
}

.trust-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 30px;
}

.trust-row span {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 7px 13px;
    border: 1px solid oklch(70% 0.07 75);
    border-color: var(--chip-border);
    border-radius: 999px;
    background: var(--chip-bg);
    color: var(--chip-text);
    font-size: 0.82rem;
    font-weight: 700;
    opacity: 0;
    animation: chipIn 360ms var(--ease-out-quart) forwards;
    transition: background 220ms var(--ease-out-quart), color 220ms var(--ease-out-quart), border-color 220ms var(--ease-out-quart), transform 160ms var(--ease-out-quart);
}

.trust-row span:nth-child(1) {
    animation-delay: 360ms;
}

.trust-row span:nth-child(2) {
    animation-delay: 410ms;
}

.trust-row span:nth-child(3) {
    animation-delay: 460ms;
}

.trust-row span:hover {
    transform: translate3d(0, -1px, 0);
}

.login-container {
    position: relative;
    width: 100%;
    padding: clamp(1.5rem, 4vw, 2.25rem);
    background: var(--panel-bg);
    border: 1px solid var(--line);
    border-radius: 24px;
    box-shadow: var(--shadow);
    opacity: 0;
    animation: authPanelIn 520ms var(--ease-out-quint) 220ms forwards;
    transition:
        background 280ms var(--ease-out-quart),
        border-color 240ms var(--ease-out-quart),
        box-shadow 240ms var(--ease-out-quart);
}

.login-container::before {
    content: '';
    position: absolute;
    inset: 12px;
    pointer-events: none;
    border: 1px solid var(--panel-inner-line);
    border-radius: 18px;
    transition: border-color 240ms var(--ease-out-quart);
}

.panel-heading {
    position: relative;
    margin-bottom: 26px;
}

.login-container h2 {
    margin: 8px 0 0;
    color: var(--ink-strong);
    font-family: 'DM Serif Display', Georgia, serif;
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 400;
    line-height: 1;
}

form {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

label {
    display: flex;
    flex-direction: column;
    gap: 8px;
    color: var(--ink);
    font-size: 0.82rem;
    font-weight: 800;
}

input,
select {
    width: 100%;
    min-height: 48px;
    padding: 12px 14px;
    border: 1px solid var(--field-border);
    border-radius: 12px;
    background: var(--field-bg);
    color: var(--ink-strong);
    font: inherit;
    font-size: 1rem;
    font-weight: 500;
    box-shadow: var(--field-inner-shadow);
    transition:
        transform 160ms var(--ease-out-quart),
        border-color 180ms var(--ease-out-quart),
        box-shadow 180ms var(--ease-out-quart),
        background 180ms var(--ease-out-quart),
        color 180ms var(--ease-out-quart);
}

select {
    appearance: none;
    -webkit-appearance: none;
    background-image:
        linear-gradient(45deg, transparent 50%, var(--copper-deep) 50%),
        linear-gradient(135deg, var(--copper-deep) 50%, transparent 50%);
    background-position:
        calc(100% - 18px) 21px,
        calc(100% - 12px) 21px;
    background-size: 6px 6px, 6px 6px;
    background-repeat: no-repeat;
}

input::placeholder {
    color: var(--field-placeholder);
}

input:focus,
select:focus,
button:focus-visible,
a:focus-visible {
    outline: 3px solid oklch(74% 0.145 78 / 0.55);
    outline-offset: 3px;
}

input:focus,
select:focus {
    border-color: var(--copper);
    background: var(--surface);
    transform: translate3d(0, -1px, 0);
    box-shadow: 0 0 0 4px oklch(74% 0.12 67 / 0.16);
}

button,
.auth-link-button {
    min-height: 48px;
    border: 0;
    border-radius: 12px;
    font-family: 'DM Sans', sans-serif;
    font-size: 0.95rem;
    font-weight: 800;
    cursor: pointer;
    text-decoration: none;
    transition:
        transform 160ms var(--ease-out-quart),
        box-shadow 180ms var(--ease-out-quart),
        background 180ms var(--ease-out-quart),
        color 180ms var(--ease-out-quart),
        border-color 180ms var(--ease-out-quart);
    will-change: transform;
}

.primary-action {
    margin-top: 8px;
    background: var(--copper);
    color: oklch(98% 0.012 68);
    box-shadow: 0 12px 24px oklch(45% 0.16 42 / 0.26);
}

.primary-action:hover {
    background: oklch(58% 0.18 39);
    transform: translateY(-2px);
    box-shadow: 0 16px 34px oklch(45% 0.16 42 / 0.32);
}

.primary-action:active,
.secondary-action:active,
.auth-link-button:active,
.shortBtn:active {
    transform: translateY(0) scale(0.985);
}

.secondary-action {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--secondary-bg);
    color: var(--secondary-text);
    border: 1px solid var(--secondary-border);
}

.secondary-action:hover,
.auth-link-button:hover {
    background: var(--secondary-bg-hover);
    transform: translateY(-1px);
}

.text-link {
    align-self: center;
    color: var(--copper-deep);
    font-size: 0.9rem;
    font-weight: 800;
    text-decoration: none;
    transition: color 180ms var(--ease-out-quart), text-underline-offset 180ms var(--ease-out-quart);
}

.text-link:hover {
    text-decoration: underline;
    text-underline-offset: 4px;
}

#additionalLinks {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 4px;
}

.shortBtn {
    min-height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--secondary-border);
    border-radius: 12px;
    background: var(--quiet-link-bg);
    color: var(--muted);
    font-size: 0.88rem;
    font-weight: 800;
    text-decoration: none;
    transition:
        transform 160ms var(--ease-out-quart),
        border-color 180ms var(--ease-out-quart),
        color 180ms var(--ease-out-quart),
        background 180ms var(--ease-out-quart);
}

.shortBtn:hover {
    background: var(--surface);
    border-color: var(--copper);
    color: var(--copper-deep);
    transform: translate3d(0, -1px, 0);
}

.fine-print {
    margin: 2px 0 0;
    color: var(--muted);
    font-size: 0.72rem;
    line-height: 1.45;
}

.fine-print a {
    color: var(--copper-deep);
    font-weight: 800;
    text-decoration: none;
    transition: color 180ms var(--ease-out-quart);
}

.fine-print a:hover {
    text-decoration: underline;
    text-underline-offset: 3px;
}

#message {
    position: relative;
    min-height: 22px;
    margin-top: 16px;
    color: var(--error);
    font-size: 0.9rem;
    font-weight: 800;
    opacity: 0;
    transform: translate3d(0, -4px, 0);
    transition: opacity 180ms var(--ease-out-quart), transform 180ms var(--ease-out-quart);
}

#message.show {
    opacity: 1;
    transform: translate3d(0, 0, 0);
    animation: messageIn 220ms var(--ease-out-quart);
}

@media (max-width: 880px) {
    .auth-shell,
    .auth-shell-register {
        grid-template-columns: 1fr;
        width: min(620px, calc(100% - 32px));
        gap: 30px;
        padding: 34px 0;
    }

    .brand-mark {
        width: 68px;
        height: 68px;
        margin-bottom: 24px;
    }

    .login-logo {
        width: 54px;
        height: 54px;
    }

    .auth-intro h1,
    .auth-shell-register .auth-intro h1 {
        max-width: 12ch;
        font-size: clamp(2.9rem, 15vw, 4.7rem);
    }

    .intro-copy {
        font-size: 0.98rem;
    }
}

@media (max-width: 520px) {
    body::before {
        background-size: 34px 34px;
    }

    .auth-shell,
    .auth-shell-register {
        width: min(100% - 24px, 460px);
        padding: 22px 0;
    }

    .auth-intro h1,
    .auth-shell-register .auth-intro h1 {
        font-size: clamp(2.35rem, 15vw, 3.4rem);
        line-height: 0.94;
    }

    .trust-row {
        gap: 8px;
    }

    .trust-row span {
        min-height: 30px;
        font-size: 0.76rem;
    }

    .login-container {
        padding: 1.25rem;
        border-radius: 18px;
    }

    .login-container::before {
        inset: 8px;
        border-radius: 13px;
    }

    .form-grid,
    #additionalLinks {
        grid-template-columns: 1fr;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-delay: 0.01ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
    }

    .auth-intro > *,
    .login-container,
    .theme-switch,
    .trust-row span,
    body::before {
        opacity: 1 !important;
        transform: none !important;
    }
}