/* =============================================================
   MFES.GE — Core Design System & Global Styles
   Author: MFES Frontend
   ============================================================= */

/* ── 1. Custom Properties ─────────────────────────────────── */
:root {
    /* Brand Palette */
    --color-graphite:      #2F3437;
    --color-graphite-light:#4A5568;
    --color-sage:          #6BAA7D;
    --color-sage-light:    #8FC4A0;
    --color-sage-muted:    rgba(107,170,125,.12);
    --color-orange:        #F7931E;
    --color-orange-dark:   #E07D10;
    --color-orange-muted:  rgba(247,147,30,.12);

    /* Neutrals */
    --color-bg:            #F8F9F8;
    --color-surface:       #FFFFFF;
    --color-surface-alt:   #F3F4F3;
    --color-border:        #E5E7EB;
    --color-border-dark:   #D1D5DB;

    /* Text */
    --color-text:          #1A1F23;
    --color-text-secondary:#6B7280;
    --color-text-muted:    #9CA3AF;
    --color-text-inverse:  #FFFFFF;

    /* Typography */
    --font-sans:   'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-mono:   'JetBrains Mono', 'Fira Code', monospace;

    --text-xs:     .75rem;
    --text-sm:     .875rem;
    --text-base:   1rem;
    --text-lg:     1.125rem;
    --text-xl:     1.25rem;
    --text-2xl:    1.5rem;
    --text-3xl:    1.875rem;
    --text-4xl:    2.25rem;
    --text-5xl:    3rem;
    --text-6xl:    3.75rem;

    --leading-tight: 1.2;
    --leading-snug:  1.35;
    --leading-base:  1.6;

    --fw-normal: 400;
    --fw-medium: 500;
    --fw-semi:   600;
    --fw-bold:   700;

    /* Spacing */
    --space-1:   .25rem;
    --space-2:   .5rem;
    --space-3:   .75rem;
    --space-4:   1rem;
    --space-5:   1.25rem;
    --space-6:   1.5rem;
    --space-8:   2rem;
    --space-10:  2.5rem;
    --space-12:  3rem;
    --space-16:  4rem;
    --space-20:  5rem;
    --space-24:  6rem;
    --space-32:  8rem;

    /* Layout */
    --container-max: 1200px;
    --container-pad: clamp(1rem, 5vw, 2rem);

    /* Radii */
    --radius-sm:   4px;
    --radius-md:   8px;
    --radius-lg:   12px;
    --radius-xl:   16px;
    --radius-2xl:  24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-xs:  0 1px 2px rgba(0,0,0,.05);
    --shadow-sm:  0 2px 8px rgba(0,0,0,.06);
    --shadow-md:  0 4px 16px rgba(0,0,0,.08);
    --shadow-lg:  0 8px 32px rgba(0,0,0,.1);
    --shadow-xl:  0 16px 48px rgba(0,0,0,.12);

    /* Transitions */
    --ease-out:  cubic-bezier(.22,.68,0,1.2);
    --ease-in:   cubic-bezier(.4,0,1,1);
    --ease-std:  cubic-bezier(.4,0,.2,1);
    --dur-fast:  150ms;
    --dur-base:  250ms;
    --dur-slow:  400ms;

    /* Z-index */
    --z-base:    1;
    --z-above:   10;
    --z-nav:     100;
    --z-modal:   200;
    --z-toast:   300;

    /* Header */
    --header-h:  72px;
}

/* ── 2. Reset & Base ──────────────────────────────────────── */
*, *::before, *::after {
    box-sizing: border-box;
    margin:  0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-h);
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-base);
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

img, video, svg {
    display: block;
    max-width: 100%;
}

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

ul, ol { list-style: none; }

button, input, textarea, select {
    font: inherit;
    color: inherit;
    border: none;
    background: none;
    outline: none;
}

button { cursor: pointer; }

h1, h2, h3, h4, h5, h6 {
    line-height: var(--leading-tight);
    font-weight: var(--fw-bold);
    color: var(--color-graphite);
}

p { color: var(--color-text-secondary); }

/* ── 3. Layout Utilities ─────────────────────────────────── */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--container-pad);
}

.section {
    padding-block: clamp(var(--space-16), 8vw, var(--space-32));
}

/* ── 4. Typography Utilities ──────────────────────────────── */
.text-accent  { color: var(--color-sage); }
.text-orange  { color: var(--color-orange); }
.text-muted   { color: var(--color-text-muted); font-size: var(--text-sm); }
.text-center  { text-align: center; }

/* ── 5. Section Header ──────────────────────────────────── */
.section-header {
    text-align: center;
    max-width: 680px;
    margin-inline: auto;
    margin-bottom: clamp(var(--space-10), 5vw, var(--space-16));
}

.section-label {
    display: inline-block;
    font-size: var(--text-xs);
    font-weight: var(--fw-semi);
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--color-sage);
    background: var(--color-sage-muted);
    padding: var(--space-1) var(--space-4);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-4);
}

.section-title {
    font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl));
    font-weight: var(--fw-bold);
    color: var(--color-graphite);
    line-height: var(--leading-tight);
    margin-bottom: var(--space-4);
}

.section-desc {
    font-size: clamp(var(--text-base), 1.5vw, var(--text-lg));
    color: var(--color-text-secondary);
    line-height: var(--leading-base);
}

/* ── 6. Buttons ──────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-weight: var(--fw-semi);
    border-radius: var(--radius-md);
    transition: all var(--dur-base) var(--ease-std);
    white-space: nowrap;
    cursor: pointer;
    text-decoration: none;
    border: 2px solid transparent;
    line-height: 1;
}

.btn:focus-visible {
    outline: 3px solid var(--color-orange);
    outline-offset: 3px;
}

/* Sizes */
.btn-sm  { font-size: var(--text-sm);  padding: var(--space-2) var(--space-4);  }
.btn-md  { font-size: var(--text-base); padding: var(--space-3) var(--space-5);  }
.btn-lg  { font-size: var(--text-base); padding: var(--space-4) var(--space-8);  }
.btn-full { width: 100%; justify-content: center; }

/* Variants */
.btn-primary {
    background: var(--color-orange);
    color: #fff;
    border-color: var(--color-orange);
    box-shadow: 0 4px 14px rgba(247,147,30,.3);
}

.btn-primary:hover,
.btn-primary:focus-visible {
    background: var(--color-orange-dark);
    border-color: var(--color-orange-dark);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(247,147,30,.4);
}

.btn-primary:active { transform: translateY(0); }

.btn-outline {
    background: transparent;
    color: var(--color-graphite);
    border-color: var(--color-border-dark);
}

.btn-outline:hover {
    border-color: var(--color-graphite);
    background: var(--color-graphite);
    color: #fff;
}

.btn-ghost {
    background: transparent;
    color: var(--color-graphite);
    border-color: var(--color-border);
}

.btn-ghost:hover {
    background: var(--color-surface);
    border-color: var(--color-graphite);
}

.btn-icon {
    flex-shrink: 0;
    transition: transform var(--dur-fast) var(--ease-out);
}

.btn:hover .btn-icon { transform: translateX(3px); }

/* ── 7. Form Elements ─────────────────────────────────────── */
.form-group { display: flex; flex-direction: column; gap: var(--space-2); }

.form-label {
    font-size: var(--text-sm);
    font-weight: var(--fw-medium);
    color: var(--color-graphite);
}

.form-label span { color: var(--color-orange); }

.form-input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    font-size: var(--text-base);
    color: var(--color-text);
    transition: border-color var(--dur-fast) var(--ease-std),
                box-shadow var(--dur-fast) var(--ease-std);
}

.form-input::placeholder { color: var(--color-text-muted); }

.form-input:hover { border-color: var(--color-border-dark); }

.form-input:focus {
    border-color: var(--color-sage);
    box-shadow: 0 0 0 3px var(--color-sage-muted);
}

.form-input.is-error { border-color: #EF4444; }
.form-input.is-error:focus { box-shadow: 0 0 0 3px rgba(239,68,68,.15); }

.form-textarea { resize: vertical; min-height: 140px; }

.form-error {
    font-size: var(--text-xs);
    color: #EF4444;
    display: none;
}

.form-error.visible { display: block; }

.form-row { display: grid; gap: var(--space-5); }

.form-row--between { display: flex; justify-content: space-between; align-items: center; }

.form-feedback {
    padding: var(--space-4);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: var(--fw-medium);
}

.form-feedback.success { background: rgba(107,170,125,.12); color: #166534; border: 1px solid rgba(107,170,125,.3); }
.form-feedback.error   { background: rgba(239,68,68,.1);    color: #991B1B; border: 1px solid rgba(239,68,68,.2);  }

/* ── 8. Loading / Spinner ────────────────────────────────── */
.loading-state {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--space-16);
    width: 100%;
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-sage);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

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

/* ── 9. Logo ─────────────────────────────────────────────── */
.logo {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    font-weight: var(--fw-bold);
    font-size: var(--text-xl);
    color: var(--color-graphite);
    letter-spacing: -0.02em;
    transition: opacity var(--dur-fast);
}

.logo:hover { opacity: .85; }

.logo-tld { color: var(--color-sage); }

.logo--light,
.logo--light .logo-text { color: #fff; }
.logo--light .logo-tld   { color: var(--color-sage-light); }

/* ── 10. Social buttons ──────────────────────────────────── */
.social-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
    background: var(--color-surface-alt);
    color: var(--color-graphite);
    transition: all var(--dur-base) var(--ease-std);
}

.social-btn svg { width: 17px; height: 17px; }

.social-btn:hover { background: var(--color-graphite); color: #fff; }

.social-btn--light { background: rgba(255,255,255,.1); color: #fff; }
.social-btn--light:hover { background: var(--color-orange); color: #fff; }

/* ── 11. Animations ──────────────────────────────────────── */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50%       { transform: translateY(-10px); }
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 0 0 rgba(107,170,125,.4); }
    50%       { box-shadow: 0 0 0 12px rgba(107,170,125,0); }
}

[data-animate] {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity var(--dur-slow) var(--ease-std),
                transform var(--dur-slow) var(--ease-std);
}

[data-animate].in-view {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger helper */
[data-animate]:nth-child(1) { transition-delay: 0ms; }
[data-animate]:nth-child(2) { transition-delay: 80ms; }
[data-animate]:nth-child(3) { transition-delay: 160ms; }
[data-animate]:nth-child(4) { transition-delay: 240ms; }
[data-animate]:nth-child(5) { transition-delay: 320ms; }
[data-animate]:nth-child(6) { transition-delay: 400ms; }

/* ── 12. Focus ring (WCAG) ──────────────────────────────── */
:focus-visible {
    outline: 3px solid var(--color-orange);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* ── 13. Selection ───────────────────────────────────────── */
::selection {
    background: rgba(107,170,125,.25);
    color: var(--color-graphite);
}

/* ── 14. Scrollbar (Webkit) ──────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--color-bg); }
::-webkit-scrollbar-thumb { background: var(--color-border-dark); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-graphite-light); }

/* ── 15. Skip link ───────────────────────────────────────── */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-4);
    background: var(--color-graphite);
    color: #fff;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    font-weight: var(--fw-semi);
    z-index: var(--z-toast);
    transition: top var(--dur-fast);
}

.skip-link:focus { top: var(--space-4); }